{"id":980,"date":"2022-03-18T15:57:00","date_gmt":"2022-03-18T07:57:00","guid":{"rendered":"http:\/\/blog.xrhoujie.com\/?p=980"},"modified":"2022-03-16T15:59:27","modified_gmt":"2022-03-16T07:59:27","slug":"%e8%bd%acts%e4%b8%ad%e7%9a%84%e6%b3%9b%e5%9e%8b","status":"publish","type":"post","link":"http:\/\/blog.xrhoujie.com\/?p=980","title":{"rendered":"(\u8f6c)TS\u4e2d\u7684\u6cdb\u578b"},"content":{"rendered":"\n<p>\u6cdb\u578b\u53ef\u4ee5\u7406\u89e3\u4e3a\u5bbd\u6cdb\u7684\u7c7b\u578b\uff0c\u901a\u5e38\u7528\u4e8e\u7c7b\u548c\u51fd\u6570<\/p>\n\n\n\n<h6>\u4e00\u3001\u6cdb\u578b\u7c7b<\/h6>\n\n\n\n<p>\u6cdb\u578b\u53ef\u4ee5\u7528\u4e8e\u7c7b\u548c\u6784\u9020\u5668\uff0c\u4f8b\u5982\uff1a<em><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Person&lt;T&gt;{\n    private _value: T;\n    constructor(val: T) {\n        this._value = val;\n    }\n}\nlet p = new Person&lt;number&gt;(12)\n<\/code><\/pre>\n\n\n\n<p>\u5982\u4e0a\uff0c<code>&lt;T&gt;<\/code>\u8868\u793a\u4f20\u9012\u4e00\u4e2a<code>T<\/code>\u7c7b\u578b\uff0c\u5728<code>new<\/code>\u7684\u65f6\u5019\u624d\u628a\u5177\u4f53\u7c7b\u578b\u4f20\u5165\u3002\u5176\u4e2dT\u662f\u53d8\u91cf\u53ef\u6539\uff0c\u4f46\u901a\u5e38\u6bd4\u8f83\u5e38\u89c1\u5c31\u662f\u5199<code>T<\/code><br>\u4e4b\u524d\u8bf4<code>TypeScript<\/code>\u7c7b\u578b\u7684\u65f6\u6709\u8bf4\u5230\u6570\u7ec4\uff0c\u5176\u5b9e\u6570\u7ec4\u672c\u8d28\u5c31\u662f\u4e00\u4e2a\u6cdb\u578b\u7c7b<em><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let a = new Array&lt;number&gt;();\n<\/code><\/pre>\n\n\n\n<h6>\u4e8c\u3001\u6cdb\u578b\u51fd\u6570<\/h6>\n\n\n\n<p>\u6cdb\u578b\u53ef\u4ee5\u7528\u4e8e\u666e\u901a\u51fd\u6570\uff0c\u4f8b\u5982\uff1a<em><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function fn&lt;T&gt;(arg: T): T {\n    return arg;\n}\nfn&lt;number&gt;(12);\n<\/code><\/pre>\n\n\n\n<p>\u5176\u5b9e\u4e0d\u7ba1\u662f\u7528\u4e8e\u7c7b\u8fd8\u662f\u7528\u4e8e\u51fd\u6570\uff0c\u6838\u5fc3\u601d\u60f3\u90fd\u662f\uff1a\u628a\u7c7b\u578b\u5f53\u4e00\u79cd\u7279\u6b8a\u7684\u53c2\u6570\u4f20\u5165\u8fdb\u53bb<\/p>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\u6cdb\u578b\u4e5f\u53ef\u4ee5\u201c\u7ee7\u627f\u201d\uff0c\u4f46\u8868\u793a\u7684\u662f\u9650\u5236\u8303\u56f4<br>\u4f8b\u5982<em><\/em><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>class Person&lt;T extends Date&gt;{\n    private _value: T;\n    constructor(val: T) {\n        this._value = val;\n    }\n}\nlet p1 = new Person(new Date())\n\nclass MyDate extends Date{}\nlet p2 = new Person(new MyDate())\n<\/code><\/pre>\n\n\n\n<p>\u4ee5\u4e0a\u662f\u6cdb\u578b\u7684\u57fa\u672c\u4f7f\u7528\uff01<\/p>\n\n\n\n<p><br>\u539f\u6587\u94fe\u63a5\uff1ahttps:\/\/www.jianshu.com\/p\/db084bda6ce6<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6cdb\u578b\u53ef\u4ee5\u7406\u89e3\u4e3a\u5bbd\u6cdb\u7684\u7c7b\u578b\uff0c\u901a\u5e38\u7528\u4e8e\u7c7b\u548c\u51fd\u6570 \u4e00\u3001\u6cdb\u578b\u7c7b \u6cdb\u578b\u53ef\u4ee5\u7528\u4e8e\u7c7b\u548c\u6784\u9020\u5668\uff0c\u4f8b\u5982\uff1a \u5982\u4e0a\uff0c&lt;T&#038;gt [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[8,1],"tags":[23],"_links":{"self":[{"href":"http:\/\/blog.xrhoujie.com\/index.php?rest_route=\/wp\/v2\/posts\/980"}],"collection":[{"href":"http:\/\/blog.xrhoujie.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.xrhoujie.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.xrhoujie.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.xrhoujie.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=980"}],"version-history":[{"count":1,"href":"http:\/\/blog.xrhoujie.com\/index.php?rest_route=\/wp\/v2\/posts\/980\/revisions"}],"predecessor-version":[{"id":981,"href":"http:\/\/blog.xrhoujie.com\/index.php?rest_route=\/wp\/v2\/posts\/980\/revisions\/981"}],"wp:attachment":[{"href":"http:\/\/blog.xrhoujie.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=980"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.xrhoujie.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=980"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.xrhoujie.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=980"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}